High voltage aerial lift and control therefor



June 9, 1964 J. M. ElTEL 3,136,385

HIGH VOLTAGE AERIAL LIFT AND CONTROL THEREFOR Filed July 6, 1962 3Sheets-Sheet l INVENTOR. Jay M. E i te! BY Ji @QZQ Attorneys J. M. EITEL3,136,385

HIGH VOLTAGE AERIAL LIFT AND CONTROL THEREFOR June 9, 1964 3Sheets-Sheet 2 Filed July 6, 1962 INVENTOR.

Jay M. E i re! Attorneys June 9, 1964 J. M. ElTEL 3,136,385

HIGH VOLTAGE AERIAL LIFT AND CONTROL THEREFOR Filed July 6, 1962 3 Sheets-Sheec 5 E MODULATOR OSCILLATOR i F i g. 9

I3! I32 155 I34 DETECTOR INVENTOR.

Jay'M. Eire! F I g. 10

Attorneys United States Patent Ofiice 3,136,385 Patented June 9, 19643,136,385 HIGH VOLTAGE AERIAL LIFT AND CONTROL THEREFOR Jay M. Eitel,Los Altos, Califi, assignor to Telsta Corp, San Carlos, Califl, acorporation of California Filed July 6, 1962,Ser. No. 208,029 9 Claims.(Ci. 182-2) This invention relates to a high voltage aerial liftand to acontrol therefor and more particularly to an aer1al lift of the typehaving a workmans platform with the controls mounted on the workmansplatform.

At the present time, there is a demand for equipment for use in therepair of high voltage transmission lines without interruption ofservice. In particular, there is a need for an aerial lift in which theworkman can be raised from the ground for work on the transmission lineand in which he will be adequately insulated so that he can work thetransmission lines withoutadditional protective equipment.

In general, it is an object of the present invention to provide anaerial lift and control therefor which can be utilized for working onhigh voltage transmission lines.

Another object of the invention is to provide an aerial lift and controltherefor of the above character in which the workman in the workmansbasket can control the operation of the lift.

Another object of the invention is to provide an aerial lift of theabove character which can be adequately insulated for work on anyexisting high voltage transmission lines.

Another object of the invention is to provide a control of the abovecharacter for the aerial lift which is relatively inexpensive and whichcan be readily maintained.

Another object of the invention is to provide a control of the abovecharacter which can be utilized with substantially conventional aeriallifts.

Additional objects and features of the invention will appear from thefollowing description in which the preferred embodiments have been setforth in detail in conjunction with the accompanying drawings.

Referring to the drawings:

FIGURE 1 is a side elevational View of a high voltage aerial liftincorporating my invention.

' FIGURE 2 is an enlarged cross-sectional view of the boom structureused in the aerial lift.

FIGURE 3 is a cross-sectional view taken along the line 33 of FIGURE 2.

FIGURE 4 is a cross-sectional view taken along the line 44 of FIGURE 2.

FIGURE 5 is a diagram with certain of the parts schematicallyillustrated of the control system utilizedin the aerial lift.

FIGURE 6 is a detailed circuit diagram of the photocell and amplifiercircuit.

FIGURE 7 is a partial side elevational view of another aerial liftincorporating my invention. 7

FIGURE 8 is a circuit diagram with certain of the parts schematicallyillustrated of the control system utilized in the aerial lift shown inFIGURE 7.

FIGURE 9 is a block diagram of the transmitter utilized in the controlsystem in FIGURE 8.

FIGURE 10 is a block diagram of the receiver utilized in the controlsystem shown in FIGURE 8.

In general, my aerial lift which is particularly adapted for use in highvoltage work consists of a self-propelled vehicle upon which a workmanslift is mounted. The

. workmans lift has a boom structure with a workmans platform secured tothe outer end. The boom structure has portions which are formed ofinsulating material for insulating the workmans platform from theremainder of the lift. A control assembly is mounted on the liftsupporting structure. Motive means is connected to the control assemblyfor operating the workmans lift so that the workmans platform can berotated about a vertical axis and raised and lowered about a horizontalaxis, and moved toward and away from the vehicle. A control mechanism ismounted on the workmans platform and has electrical switches. Means isprovided which is insulated from the remainder of the lift supportingstructure for controlling the operation of the control assembly from thecontrol mechanism. This means includes a power supply which is mountedadjacent the workmans platform and circuitry which connects the powersupply through the switches of the control mechanism.

As shownin the drawings, my insulated or high voltage aerial liftconsists of a self-propelled vehicle 11 having front and rear wheels 12and 13 and a framework 14 mounted upon the front and rear wheels. A cab16 is mounted on the framework 14 in a conventional manner. A liftingequipment 18 is mounted on the rear of the vehicle on the framework 14.The lifting equipment 18 can be of any suitable type. For example, itcan be of the extensible boom type which is shown in the drawings or itcan be of the elbow type, if desired.

The lifting equipment 18 which I have used is provided with a loadsupporting structure or turret 19 which is mounted upon the framework 14in the manner shown in US. Patent No. 2,841,404. As disclosed in thatpatent, the load supporting structure 19 is mounted for rotation about avertical axis by means which includes a rotating drive assembly 21. Aboom structure 22 is pivotally mounted for movement about a horizontalaxis formed by a shaft 23 carried by upper portions of the loadsupporting structure 19 as shown particularly in FIGURE 1. Means isprovidedfor raising and lowering the outer free end of the boomstructure or, in other words, for swing- .ing the boom structure aboutthe horizontal axis provided sections, it is desirable that the inner ortelescoping section be formed of a suitable insulating material. Onetype of insulating material found to be satisfactory for fabricating atelescoping boom section is fibreglass bonded together with epoxyresins. Means is provided for extending and retracting the telescopingboom section 27 with respect to the main or outer section 26and'includes a telescoping drive assembly 28 of the type which isdisclosed in my Patent No. 2,896,750. As disclosed in that patent, thismeans for extending and retracting the telescoping boom section 27consists of a sprocket wheel 31 which is driven by the telescoping driveassembly 23. The sprocket 31 drives a chain 32 which, in turn, drives asprocket 33. The sprockets 31 and 33 are mounted on the mainboom section26, whereas the two ends of the chain 32 are secured to the inner ortelescoping boom section. b

The front end of the outer boom section 26 is provided with a pluralityof rollers 36 which engage the side walls of the inner boom section-23as shown particularly in FIGURE 3. The inner end of the inner ortelescoping boom 27 is provided with rollers 37 which engage the innersurface of the outer boom section 26. The inner boom structure includesadditional apparatus which will be described in detail in conjunctionwith the control apparatus utilized in my aerial lift.

A workmans or operators platform or lift 41 is mounted on the outer freeend of the boom structure on a pair of arms 42 which are aflixed to theouter end of the telescoping boom section 27. The platform or lift 41has its upper end secured to the arms 42 by pins 43 so as to permit theworkmans platform to continuously assume a level condition as the boomstructure is raised and lowered about the horizontal axis provided bythe shaft 23.

Control means is provided for controlling the operation of the boomstructure, either from the workmans basket or platform 41, or from theground or from the vehicle itself. Such means includes a motor generatorset 46 of a suitable type such as a generator driven by a gasolineengine. The output from the generator is supplied to a control panel 47which includes an assembly of mechanically interlocked magneticreversing relays which are protected with thermal overloads. Theserelays can be controlled either by ground control mechanism 48 or by acontrol mechanism 49. The ground control mechanism 48 is preferablymounted on the load supporting structure or turret 19 so that the driveassemblies 21, 24 and 28 can be operated either from the vehicle or fromthe ground. The control mechanism 49 is mounted in the basket orplatform 41 and is utilized for controlling the drive assemblies 21, 24and 28 from this position. The control mechanism 49 is of a type whichis described in my Patent No. 2,841,404. As disclosed in that patent, itincludes a plurality of switches, namely, seven microswitches which areadapted to be operated by the control lever 51.

Means is provided for connecting the control mechanism 49 to the controlpanel 47 which, at the same time, will provide suitable high voltageinsulation for a purpose hereinafter described. This means consists of asuitable power supply such as a battery 52 which is mounted in asuitable location adjacent the control mechanism 49 such as within theworkmans basket 41. As shown in FIGURE 5, one side of the battery 52 isconnected to the control mechanism 49 in such a manner so that it isconnected to all six of the switches which are utilized for operatingthe drives 21, 24 and 28 through the safety switch. The other side ofthe battery is connected to one side of lamps 54 by a conductor 56 whichforms a part of a cable 57 which extends from the workmans platform 41to the outer end of the telescoping boom section 27 as shownparticularly in FIGURE 2. The other sides of the lamps 54 are connectedto the other sides of the six switches within the control mechanism 49by conductors 58 which also form a part of the cable 57. The lamps 54serve as means for emitting light rays. Suitable means is provided fortransmitting the light rays from each of the lamps and consists of aplurality of light conducting rods or members 61 of a suitableinsulating material such as Lucite. The Lucite rods can be of anydesired dimension. For example, I have found that Lucite rods eachhaving a diameter of A inch and a length of approximately 4 ft. aresuitable. The length of the Lucite rods is primarily determined by thevoltages which are to be encountered by the apparatus. The members 61must be formed of an insulating material which will not break down underhigh voltages. Each of the Lucite rods 61 is preferably shrouded in asuitable light reflecting casing 62 to prevent light from entering anyone of the rods from the other rods. It is also preferable that all therods 61 be mounted in a unitary assembly and that the entire assembly beenclosed in a light-tight housing 63 which is connected to the housing64 which carries the lamps 54.

Photosensitive means in the form of photosensitive elements 66 areprovided at the end of each of the light conducting members 61. Theelements 66 sense when light is present or when light is not present inthe associated light transmitting member 61. In my embodiment, I havechosen to utilize the photosensitive elements 66 to sense when the lamps54 are energized. These photosensitive elements are carried within ahousing 67 mounted on the other end of the housing 63.

From the construction shown, it can be seen that the housings 63, 64 and67 are formed as a unitary structure which is mounted in the forward endon one side of the telescoping boom section 27 as shown particularly inFIGURES 2 and 4. This makes it possible to readily remove the entireassembly for maintenance and replacement when desired. Thephotosensitive elements 66 are connected by conductors 71 and a commonconductor 72 provided in a cable 73 to an amplifier and power supplyassembly 74 which is mounted in a housing 75 secured to the outer boomsection 26 as shown in FIGURE 2. The amplifier and power supply 74 isconnected by a cable 76 to the control assembly in panel 47 for controloperations as hereinafter described.

A take-up assembly is provided within the inner boom section 27 fortaking up the cable 73 as the telescoping section 27 is extended andretracted. It consists of a dolly assembly 81 which includes wheels 82which ride in the four corners of the inner boom section 27, as shownparticularly in FIGURE 4. Movement of the dolly within the inner boomsection 27 is controlled by a cable 83. One end of the cable 83 issecured to a turnbuckle 84 which is yieldably restrained in its movementby a spring 86 mounted within a bracket 87 secured to a reel supportmember 88. The cable 83 is reeved over a pulley 89 which is mounted inthe front end of the dolly assembly 81. It then passes over a pulley 91which is rotatably mounted in a pulley support 88 provided in the frontend of the telescoping boom section 27. The cable then extendsrearwardly and is reeved over a pulley 91 which is mounted in an opening92 provided in the boom section 27. The other end of the cable 83 isthen secured to the outer boom section 26 by a bolt 93 as shownparticularly in FIGURE 2. The cable 73, after it passes from the housing67, extends rearwardly and passes over a sheave 96 which is mounted onthe rear end of the inner telescoping section 27 and then passesforwardly over a sheave 97 mounted within the dolly assembly 81. It thenextends rearwardly to the housing 75.

It can be seen that as the inner boom 27 is extended and retracted withrespect to the outer boom section by movement of the sprocket wheel 31and the associated chain and sprocket 33, that the dolly assembly 81will be caused to travel by the cable 83 within the inner boom section27 to take up all the slack in the cable 73.

Suitable circuitry is provided for the amplifier and power supply 74 andfor the photosensitive element 66. Typical circuitry is shown in FIGURE6. Only one channel has been provided in FIGURE 6. However, it isreadily apparent that seven similar channels can be readily provided.The circuitry forms a bridge in which the potentiometer 101 forms two ofthe legs of the bridge, the photosensitive element 66 forms another legand the battery 102 in series with the winding of the relay 103 formsthe last leg. The battery 104 is connected across the input terminals ofthe bridge. The output from the bridge is supplied across the emitterand base elements of a transistor 106. The collector element of thetransistor 106 is connected to one end of the Winding of the relay 103.The potentiometer 101 is set so that when light rays shine on thephotosensitive element 66, the transistor 106 will be triggered tooperate the relay 103. The transistor 106 is forward biased by thedifferential between the two batteries 102 and 104. Resistor 107 isprovided for stabilization. Operation of the relay 103 closes itsnormally open contacts to supply power to energize the associated relayin the control panel 47.

In one embodiment of my apparatus, the circuitry shown in FIGURE 6 wascomprised components:

of the following Photosensitive element 66-Clairex type CL 6041..

Transistor-2N35 Relay 103Advance Electric & Relay Co. SVIC 5500B.Resistor 107l.3 megohms. Potentiometer 101-50 K. ohms.

Battery 102-15 v.

Battery 104-22.5 v.

Operation and use of my insulated or high voltage aerial lift may now bebriefly described as follows. Let it be assumed that it is desired toutilize the aerial lift for replacing insulators on a high voltagetransmission line such as that shown in the drawing which includestowers 116 which carry insulators 117 and in which the conductors 118are carried by the insulators. Let it also be assumed that this is anoperating transmission line and it is very undesirable to deenergize thelines, and

for that reason it is necessary to work the lines hot. Let

I it also be assumed that the transmission lines 118 carry anism 49 orthe ground control mechanism 48. Thus, as

described in my Patent No. 2,841,659, the control lever 51 of thecontrol mechanism can be operated like a joy stick to selectivelyoperate desired switches to obtain the desired motion of the boomstructure and to thereby position the workmans basket 41 in the desiredposition. For example, as described in my Patent No. 2,841,659, thecontrolmechanism 49 can be actuated to operate the drive assemblies 21,24 and 23, either, singly or in any desired combination, and in eitherforward or reverse. When one of the-switches is closed, power issupplied from the battery 52 to energize the lamp 54. The lamp 54transmits light rays down the associated Lucite rod 61 to the associatedphotosensitive element which, in turn, causes operation of theassociated amplifier circuitry to operate the proper relay within thecontrol panel 47 and to thereby operate the proper drive assembly. Thecircuitry utilized to obtain the desired operation of the driveassemblies 21,24 and 28 is described in detail in my Patent No.2,936,847, and for that reason will not be described in detail. Thus, itcan be seen that with the construction shown, the workmans basket 41 andthe outer end of the boom structure can be rotated about a verticalaxis, raised and lowered about a horizontal axis, and moved toward andaway from the vehicle.

From this construction, it can be seen that the operator in the Workmansplatform is safe because the workmans platform 41 is insulated fromground by the use of' the insulated boom structure 27 and the use of theLucite rods 61. V

The operator, of the vehicle and an operator utilizing the groundcontrol mechanism 48 should also be safe from high voltage on thetransmission lines because the outer endof 'theboom structure whichcould possibly come in contact with the transmission lines is insulatedfrom the remainder of the boom structure and the vehicle so thattheywill not be subjected to the high voltages.

Other means may be providedfor obtaining the desired high voltageinsulation between the control mechanism 49 and the control panel 47.For example, apparatus utilizing electromagnetic waves, infrared,microwaves, ultrasonic waves and other known modes of communication canbe used. Thus, I have shown a transmitter 121 which is mounted on theouter end of the telescoping boom 27 and a receiver 122 which is mountedon the outer boom 26. As shown in FIGURE 8, the control mechanism 49 isconnected to the transmitter 121, whereas the receiver 122 is connectedto the control panel 47 p A block diagram of a suitable transmitter isshown in FIGURE 9. It is of the ultrasonic type and consists of amodulator 126 which modulates the carrier provided by the oscillator 127'to provide the necessary side bands. The output of the oscillator issupplied to a suitable radiator 128. A block diagram of the receiver isshown in FIGURE 10 and consists ofa microphone 131 which is connected toan amplifier 132. The output of the amplifier is supplied to adetec'tor133 which is connected to a tunedrelay 134. The output of the tunedrelay 134 is connected to the control panel 47. Ultrasonic apparatus ofthis type is now available. For example,

the oscillator 127 can operate at a carrier frequency of utilized in theoscillator 127 as a radiator 128 and also as a precision frequencycontrol for the oscillator. The microphone 131 and the receiver can be abarium titanate tranducer, the output of which can be amplified anddetected in transistorized amplifiers and detectors. The detected audiosignal is fed into the magnetic tuned relay 134'which has one tuned reedfor each of the modulating frequencies. In addition, the relay has amagnetic holding circuit which is excited from the detector. Therefore,when any reed begins to vibrate, it is held by a magnetic holdingcircuit. Apparatus of a similar type is presently being used forremotely operating slide projectors.

Operation and use of the control system and apparatus shown in FIGURES7-10 is very similar to that hereinbefore described. Operation of thecontrol mechanism 49 will cause the carrier frequency of the oscillator127 to be modulated with the appropriate frequencies. These frequenciesare received by the receiver and will cause operation of the associatedrelays in the control panel 47 to thereby control the drive assemblies21, 24 and 28 in the manner desired.

It is also apparent that this control will provide the desiredinsulation in view of the fact that the transmitter and receiver areseparated by relatively great distances by air and also because thetransmitter 121 is mounted on the insulated telescoping boom section 27and the receiver 122 is mounted on the main section 26.

As hereinbefore pointed out, it is readily apparent that othertransmitting and receiving systems'can be utilized ,of the aerial lift,while at the same time retaining the same method of control which iswell known to those I utilizing this type of equipment.

I claim: 1. In an aerial lift, a self-propelled vehicle, a workmans liftmounted on the vehicle and having a'boomstructure with a workmansplatform secured to its outer end, the

- boom structure having itsv outer extremity formed of insulatingmaterial for insulating the workmans platform from the remainder of thelift, a power supply mounted adjacent the outer end of said boomstructure and insulated from the remainder of the boom structure, acontrol mechanism mounted on the workmans platform and having aplurality of electrical switches connected to said power supply, acontrol assembly mounted on the lift, motive means connected to thecontrol assembly and operated by the control assembly for operating theworkmans lift so that the outer end of the boom structure and theworkmans platform can be rotated about a vertical axis, raised andlowered about a horizontal axis and moved toward and away from thevehicle, and means connecting the control mechanism to the controlassembly so that the control assembly will be operated in accordancewith the conditioning of the switches in the control mechanism andhaving good insulating qualities serving to electrically insulate thecontrol mechanism from the control assembly.

2. In an aerial lift, a self-propelled vehicle, a workmans lift mountedon the vehicle and having a boom structure with a workmans platformsecured to the outer end, the boom structure having portions formed ofinsulating material for insulating the workmans platform from theremainder of the lift, a control mechanism mounted on the workmansplatform, a control assembly mounted adjacent the workmans lift, motivemeans connected to the control assembly for operating the workmans liftso that the outer end of the boom structure and the workmans platformsecured thereto can be rotated about a vertical axis, raised and loweredabout a horizontal axis and moved toward and away from the vehicle,control circuitry connecting the control mechanism in the workmansplatform to the control assembly and serving to electrically insulatethe control mechanism from the control assembly, and a power supplymounted adjacent the outer end of the boom structure and insulated fromthe remainder of the boom structure, the control mechanism having aplurality of electrical switches, circuitry connecting the power supplyto the electrical switches, control means mounted on the outer end ofthe boom structure and circuitry connecting the switches in the controlmechanism to the control means.

3. In an aerial lift, a self-propelled vehicle, a workmans lift mountedon the vehicle and having a boom structure with a workmans platformsecured to the outer end, the boom structure having portions formed ofinsulating material for insulating the workmans platform from theremainder of the lift, a control mechanism mounted on the workmansplatform, a control assembly mounted adjacent the workmans lift, motivemeans connected to the control assembly for operating the workmans liftso that the outer end of the boom structure and the workmans platformsecured thereto can be rotated about a vertical axis, raised and loweredabout a horizontal axis and moved toward and away from the vehicle,control circuitry connecting the control mechnism in the workmansplatform to the control assembly and serving to electrically insulatethe control mechanism from the control assembly, the control circuitryconnecting the control mechanism to the control assembly including atransmitter mounted adjacent the outer end of the boom assembly and areceiver mounted adjacent the remainder of the workmans lift. p

4. An aerial lift as in claim 3 wherein the transmitter and receiver aremounted on the exterior of the boom structure.

5. In an aerial lift, a self-propelled vehicle, a workmans lift mountedon the vehicle and having a boom structure with a workmans platformsecured to the outer end, the boom structure having portions formed ofinsulating material for insulating the workmans platform from theremainder of the lift, a control mechanism mounted on the workmansplatform, a control assembly mounted adjacent the workmans lift, motivemeans connected to the control assembly for operating the workmans liftso that the outer end of the boom structure and the workmans platformsecured thereto can be rotated cases about a vertical axis, raised andlowered about a horizontal axis and moved toward and away from thevehicle, control circuitry connecting the control mechanism in theworkmans platform to the control assembly and serving to electricallyinsulate the control mechanism from the control assembly, the controlmechanism having a plurality of switches, the means connecting thecontrol mechanism to the control assembly including a plurality oflamps, a power supply, circuitry connecting the power supply to thelamps through the switches in the control mechanism so that the lampsare selectively energized upon operation of the control mechanism, alight transmitting member having good insulating qualities associatedwith each of the lamps so that the light from the lamp will betransmitted by the light transmitting member, a photosensitive elementassociated with each of the light transmitting members and adapted toreceive light transmitted by the same, and circuitry connecting thephotosensitive elements to the control assembly.

6. In an aerial lift, a self-propelled vehicle, a workmans lift mountedon the vehicle and having a boom structure with a workmans platformsecured to its outer end, the boom structure having its outer extremityformed of insulating material for insulating the workmans platform fromthe remainder of the lift, a control mechanism mounted on the workmansplatform and having a plurality of electrical circuits, a controlassembly mounted on the lift, .motive means connected to the controlassembly and operated by the control assembly for operating the workmanslift so that the outer end of the boom structure and the workmansplatform secured thereto can be rotated about a vertical axis, raisedand lowered about a horizontal axis and moved toward and away from thevehicle, means connecting the control mechanism to the control assemblyso that the control'assembly will be operated in accordance with theconditioning of the switches in the control mechanism, saidlast namedmeans having good insulating qualities serving to electrically insulatethe control mechanism from the control assembly, said control meansincluding a power supply mounted adjacent the outer end of the boomstructure, a transmitter mounted adjacent the outer end of the boomstructure, circuitry connecting the power supply through the controlmechanism to the transmitter so that the transmitter is operated inaccordance with the positioning of the control mechanism, a receivermounted adjacent the remainder of the workmans lift, the transmitter andthe receiver being insulated from each other, and circuitry connectingthe receiver to the control assembly.

7. An aerial lift as in claim 6 wherein the transmitter is an ultrasonictransmitter and wherein the receiver is an ultrasonic receiver.

8. An aerial lift as in claim 6 wherein the transmitter is a lightemitting transmitter and wherein the receiver is a light receivingreceiver.

9. An aerial lift as in claim 8 wherein the means connecting the controlmechanism to the control assembly includes a plurality of lighttransmitting members.

References Cited in the file of this patent UNITED STATES PATENTS

1. IN AN AERIAL LIFT, A SELF-PROPELLED VEHICLE, A WORKMAN''S LIFTMOUNTED ON THE VEHICLE AND HAVING A BOOM STRUCTURE WITH A WORKMAN''SPLATFORM SECURED TO ITS OUTER END, THE BOOM STRUCTURE HAVING ITS OUTEREXTREMITY FORMED OF INSULATING MATERIAL FOR INSULATING THE WORKMAN''SPLATFORM FROM THE REMAINDER OF THE LIFT, A POWER SUPPLY MOUNTED ADJACENTTHE OUTER END OF SAID BOOM STRUCTURE AND INSULATED FROM THE REMAINDER OFTHE BOOM STRUCTURE, A CONTROL MECHANISM MOUNTED ON THE WORKMAN''SPLATFORM AND HAVING A PLURALITY OF ELECTRICAL SWITCHES CONNECTED TO SAIDPOWER SUPPLY, A CONTROL ASSEMBLY MOUNTED ON THE LIFT, MOTIVE MEANSCONNECTED TO THE CONTROL ASSEMBLY AND OPERATED BY THE CONTROL ASSEMBLYFOR OPERATING THE WORKMAN''S LIFT SO THAT THE OUTER END OF THE BOOMSTRUCTURE AND THE WORKMAN''S PLATFORM CAN BE ROTATED ABOUT A VERTICALAXIS, RAISED AND LOWERED ABOUT A HORIZONTAL AXIS AND MOVED TOWARD ANDAWAY FROM THE VEHICLE, AND MEANS CONNECTING THE CONTROL MECHANISM TO THECONTROL ASSEMBLY SO THAT THE CONTROL ASSEMBLY WILL BE OPERATED INACCORDANCE WITH THE CONDITIONING OF THE SWITCHES IN THE CONTROLMECHANISM AND HAVING GOOD INSULATING QUALITIES SERVING TO ELECTRICALLYINSULATE THE CONTROL MECHANISM FROM THE CONTROL ASSEMBLY.